The compressor had what appeared to be oil on the top and back. A mechanic, said I needed a new compressor. So he replaced the compressor and dryer. While doing so, he explained that the system was unbelievably dirty. He replaced the compressor, used a chemical to to clean out the condenser and expansion valve but did not have a pressurized machine system to do this. Did not replace the expansion valve because it looks like I've got to remove the fender to do so.

System is now blowing 58 degrees while at idle and the temp on highway actually goes up three to five degrees???(63-64 degrees).

Took the car to a friend who hooked up gauges. Red gauges, high pressure showed 300, which was explained to me as a blockage, most likely the expansion valve. He also said system was fully charged and not over filled. He said the window on dryer was showing there is air in the system and it should show a continual flow without bubbles.

Questions....

a. Do I need to remove the fender to replace the expansion valve? b. Will I damage anything if I let the pressure out with a screw driver on the low end and then replace the expansion valve in my garage? c. After the expansion valve has been replaced, should I bring car to shop that has a cleaning machine and have the system cleaned. d. Do I need to replace the dryer again? e. Any other advice would be greatly appreciated.